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Merge tag 'fscrypt-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt

Browse Source 
Pull fscrypt updates from Eric Biggers:

 - Preparations for supporting encryption on ext4 filesystems where the
   filesystem block size is smaller than PAGE_SIZE.

 - Don't allow setting encryption policies on dead directories.

 - Various cleanups.

* tag 'fscrypt-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt:
  fscrypt: document testing with xfstests
  fscrypt: remove selection of CONFIG_CRYPTO_SHA256
  fscrypt: remove unnecessary includes of ratelimit.h
  fscrypt: don't set policy for a dead directory
  ext4: encrypt only up to last block in ext4_bio_write_page()
  ext4: decrypt only the needed block in __ext4_block_zero_page_range()
  ext4: decrypt only the needed blocks in ext4_block_write_begin()
  ext4: clear BH_Uptodate flag on decryption error
  fscrypt: decrypt only the needed blocks in __fscrypt_decrypt_bio()
  fscrypt: support decrypting multiple filesystem blocks per page
  fscrypt: introduce fscrypt_decrypt_block_inplace()
  fscrypt: handle blocksize < PAGE_SIZE in fscrypt_zeroout_range()
  fscrypt: support encrypting multiple filesystem blocks per page
  fscrypt: introduce fscrypt_encrypt_block_inplace()
  fscrypt: clean up some BUG_ON()s in block encryption/decryption
  fscrypt: rename fscrypt_do_page_crypto() to fscrypt_crypt_block()
  fscrypt: remove the "write" part of struct fscrypt_ctx
  fscrypt: simplify bounce page handling
This commit is contained in:
Linus Torvalds
2019-07-10 20:51:03 -07:00
parent 40f06c7995 0564336329
commit 25cd6f355d
14 changed files with 368 additions and 291 deletions
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98
include/linux/fscrypt.h
View File

@@ -63,16 +63,13 @@ struct fscrypt_operations {
unsigned int max_namelen;
};
/* Decryption work */
struct fscrypt_ctx {
union {
struct {
struct page *bounce_page; /* Ciphertext page */
struct page *control_page; /* Original page */
} w;
struct {
struct bio *bio;
struct work_struct work;
} r;
};
struct list_head free_list; /* Free list */
};
u8 flags; /* Flags */
@@ -106,18 +103,33 @@ static inline void fscrypt_handle_d_move(struct dentry *dentry)
extern void fscrypt_enqueue_decrypt_work(struct work_struct *);
extern struct fscrypt_ctx *fscrypt_get_ctx(gfp_t);
extern void fscrypt_release_ctx(struct fscrypt_ctx *);
extern struct page *fscrypt_encrypt_page(const struct inode *, struct page *,
unsigned int, unsigned int,
u64, gfp_t);
extern int fscrypt_decrypt_page(const struct inode *, struct page *, unsigned int,
unsigned int, u64);
static inline struct page *fscrypt_control_page(struct page *page)
extern struct page *fscrypt_encrypt_pagecache_blocks(struct page *page,
unsigned int len,
unsigned int offs,
gfp_t gfp_flags);
extern int fscrypt_encrypt_block_inplace(const struct inode *inode,
struct page *page, unsigned int len,
unsigned int offs, u64 lblk_num,
gfp_t gfp_flags);
extern int fscrypt_decrypt_pagecache_blocks(struct page *page, unsigned int len,
unsigned int offs);
extern int fscrypt_decrypt_block_inplace(const struct inode *inode,
struct page *page, unsigned int len,
unsigned int offs, u64 lblk_num);
static inline bool fscrypt_is_bounce_page(struct page *page)
{
return ((struct fscrypt_ctx *)page_private(page))->w.control_page;
return page->mapping == NULL;
}
extern void fscrypt_restore_control_page(struct page *);
static inline struct page *fscrypt_pagecache_page(struct page *bounce_page)
{
return (struct page *)page_private(bounce_page);
}
extern void fscrypt_free_bounce_page(struct page *bounce_page);
/* policy.c */
extern int fscrypt_ioctl_set_policy(struct file *, const void __user *);
@@ -223,7 +235,6 @@ static inline bool fscrypt_match_name(const struct fscrypt_name *fname,
extern void fscrypt_decrypt_bio(struct bio *);
extern void fscrypt_enqueue_decrypt_bio(struct fscrypt_ctx *ctx,
struct bio *bio);
extern void fscrypt_pullback_bio_page(struct page **, bool);
extern int fscrypt_zeroout_range(const struct inode *, pgoff_t, sector_t,
unsigned int);
@@ -283,32 +294,51 @@ static inline void fscrypt_release_ctx(struct fscrypt_ctx *ctx)
return;
}
static inline struct page *fscrypt_encrypt_page(const struct inode *inode,
struct page *page,
unsigned int len,
unsigned int offs,
u64 lblk_num, gfp_t gfp_flags)
static inline struct page *fscrypt_encrypt_pagecache_blocks(struct page *page,
unsigned int len,
unsigned int offs,
gfp_t gfp_flags)
{
return ERR_PTR(-EOPNOTSUPP);
}
static inline int fscrypt_decrypt_page(const struct inode *inode,
struct page *page,
unsigned int len, unsigned int offs,
u64 lblk_num)
static inline int fscrypt_encrypt_block_inplace(const struct inode *inode,
struct page *page,
unsigned int len,
unsigned int offs, u64 lblk_num,
gfp_t gfp_flags)
{
return -EOPNOTSUPP;
}
static inline struct page *fscrypt_control_page(struct page *page)
static inline int fscrypt_decrypt_pagecache_blocks(struct page *page,
unsigned int len,
unsigned int offs)
{
return -EOPNOTSUPP;
}
static inline int fscrypt_decrypt_block_inplace(const struct inode *inode,
struct page *page,
unsigned int len,
unsigned int offs, u64 lblk_num)
{
return -EOPNOTSUPP;
}
static inline bool fscrypt_is_bounce_page(struct page *page)
{
return false;
}
static inline struct page *fscrypt_pagecache_page(struct page *bounce_page)
{
WARN_ON_ONCE(1);
return ERR_PTR(-EINVAL);
}
static inline void fscrypt_restore_control_page(struct page *page)
static inline void fscrypt_free_bounce_page(struct page *bounce_page)
{
return;
}
/* policy.c */
@@ -410,11 +440,6 @@ static inline void fscrypt_enqueue_decrypt_bio(struct fscrypt_ctx *ctx,
{
}
static inline void fscrypt_pullback_bio_page(struct page **page, bool restore)
{
return;
}
static inline int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk,
sector_t pblk, unsigned int len)
{
@@ -692,4 +717,15 @@ static inline int fscrypt_encrypt_symlink(struct inode *inode,
return 0;
}
/* If *pagep is a bounce page, free it and set *pagep to the pagecache page */
static inline void fscrypt_finalize_bounce_page(struct page **pagep)
{
struct page *page = *pagep;
if (fscrypt_is_bounce_page(page)) {
*pagep = fscrypt_pagecache_page(page);
fscrypt_free_bounce_page(page);
}
}
#endif /* _LINUX_FSCRYPT_H */